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Interesting. On Type2 or was it Vanagon list there was a long discussion on synthetic oil, with several people who have used both in the same engine, with detailed reports of engine oil and cyl head temp. My conclusion, change to synthetic. Note: one has to convert correctly, or stuff the synth brings out, loosens up, etc. and can clog oil passages, thus leading to bad things! - Jeff '67 Sqbk > Read the Gene Berg tech articles on Synth oil. You'll find that synth > oil REPELS heat making it useless as a cooling mechanism in the air > cooled motor. I'm sticking with Castrol 20W-50 for my money.